vs pro help

I am having a problem with the pvr feature on my vs pro I have a acomdata 120 gb external hd connected via usb back port it is detected the hdd is western digital 7200 rpm drive and it has its own power source ac and I can record a show but many times it will record the whole show take up the space but when I try to watch it I will only be able to watch 2 sec of it then it goes right back to the channel I was watching before I tried to play the recorded program could somebody let me know how to fix this problem thanks in advance
 
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